Abstract
In this study, a new type of double-pontoon floating breakwater was designed to improve the wave attenuation performance through the addition of suspended Savonius propeller-blade. Its hydrodynamic characteristics were studied through numerical simulations and performance-testing experiment. The following investigations were performed in this study: Firstly, wave theory and hydrodynamic theory were combined to calculate the wave attenuation performance and motion response of double-pontoon floating breakwater under linear wave conditions. The numerical results showed that the wave attenuation performance was better under a specific wave period and height, the transmission coefficient reached a relatively small value, and the mooring line tension responded periodically and satisfied the condition of maximum breaking force. Secondly, three key geometric parameters of breakwater were researched, including the relative spacing of pontoons, the relative spacing between pontoons and blades, and the height–diameter ratio of Savonius blades. The calculation results showed that the pontoon spacing was closer to the wavelength and the breakwater wave attenuation performance was better. Lastly, experimental tests were also performed on the new double-pontoon floating breakwater and the results showed that the wave attenuation performance and numerical projections were basically the same, which verified the validity and effectiveness of the design method.
Highlights
IntroductionThe field of floating breakwaters has begun to gradually increase in popularity
In recent years, the field of floating breakwaters has begun to gradually increase in popularity
Scholars in many countries have carried out a great number of numerical simulation modeling and experimental studies on floating breakwater and have made many achievements in this field
Summary
The field of floating breakwaters has begun to gradually increase in popularity. Sannasiraj et al [2] theoretically and experimentally studied floating breakwaters, and measured the motion response, mooring force and transmission coefficient of floating breakwaters for three different mooring structures. G.H. et al [3] studied three floating breakwater structures: the single-box structure, the double-box structure and the plate mesh structure They conducted two-dimensional physical model tests in a wave-making tank in the laboratory, and measured the wave transmission coefficient of three types of breakwaters under regular waves with or without flow. A double-pontoon Savonius paddle floating breakwater structure was proposed This structure has a wave-attenuating effect and stability of motion, and considers the coupling effect of S-shaped blade on the hydrodynamic performance of the breakwater. Its influence on the hydrodynamic results were analyzed based on three key geometric parameters
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